David p



DQP. STIR-K.

(No Model.)

GAS MIXER.

Patented Feb. 13, 1894.

m F um m .7 ,a 7% m WWW/7% m @MM UNITED STATES PATENT Enron.

DAVID P. STIRK, OF INDIANAPOLIS, INDIANA.

G A S M I X E R SPECIFICATION forming part of Letters Patent No.514,631, dated February 13, 1894.

Application filed March 11, 1893. Serial No. 465,576. (No model.)

To all whom it -ma y concern:

Be it known that 1, DAVID P. STIRK, a citi zen of the United States, andaresident of Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Gas-Mixers, ofwhich proved mixer in elevation, as applied to the gas supplying nipple.Fig. 2 shows the same in longitudinal section. Fig. 3 is a cross-sectiontaken at the base of the mixer showing the manner of securing it to thegas supplying nipple; and Fig. 4 shows the nipple in side and inendviews. Fig. 5 is a top view of the exit end; and Fig. 6 is across-section through the exit openings.

A single casting forms the body of the mixer. It is cylindrical and itsinterior chamber is preferably tapering from its inlet to its outletend. It is of two diameters which at their junction form an interiorbeveled wall a inclining upward toward the exit end so as to form adeflecting shoulder. Its part b of least diameter terminates in a solidend or cap 0, and has openings 61 in its walls just beneath its solidend for the exit of the gas. These openings are preferably of oblongform to give a larger area for the passage of a large volume of air andgas to the burner, which may be of any suitable construction and appliedto the upper end of the mixer. The part c of greatest diameter of thiscasting is open at its base and has a yoke or open frame f extendingfrom its open end formed with a circular opening 9 central with themixer chamber, within which opening the supply nipple h is secured sothat its orificet' will be about half an inch back of the entrance orinner open endj of the mixer chamber, and therefore, it will deliver thegas within the space between the yoke arms and outside of the mixer, sothat the volume of gas issuing from the nipple orifice under pressurewill create a vacuum and carry with it into the mixer-chamber, a largevolume of air. The supply nipple h is made with a cylindrical neck mfitting the central opening in the yoke, a shouldered part 71. fittingagainst the outer end of the yoke and with fins or ribs r on the nipplesides. The central yoke opening has groovesson itsinner walls whichcorrespond with the fins on the nipple and permit the latter to beinserted through the yoke opening and then turning it to engage the saidribs with the yoke and thus secure the nipple in place by aslip-lock.This construction permits of the convenient connection and separation ofthe mixer and nipple, and avoids the expense and trouble of screwthreaded connections. I prefer to form the inner walls of the mixerchamber with projections, fingers or knobs it, having any suitabledisposition that will best promote and assist in the mixing of the airand gas in its passage to the exit openings and contact with the wallsof said chamber and in its rebounding action within the chamber, and Iprefer to confine these projections to that part of the chamber of leastdiameter, because it is in this part of the chamber where the gas andair are more intimately brought together. I prefer to make the mixingchamber tapering as stated to give the advantage of bringing the flowingvolume of air and the flowing volume of gas gradually together as theyreach the exit openings; and I make the receiving end of the mixingchamber the largest for the more free admission of the air and thecreation of a vacuum at a point outside of and within the entrance ofthe chamber. As shown the area of the exit openings is about two thirdsof the circumference of the walls, and the solid parts which form them-I prefer to make beveled or rounding on their inner sides so as tofacilitate the free outflow of the mixture to the burner. In other wordsI make the walls of the exit openings t0 flare outward all around. Thenipple has a screw threaded part to by which it is attached to the gassupply-pipe and it may have one or more orifices. I prefer to make thenipple case-hardened to prevent the ori fice being drilled larger by theconsumer, as the capacity of nipple is always suited to the capacity ofthe mixer.

In the drawings the arrows indicate the course of the mixing flow in themixing chamber to produce the perfect mixture of the gas and airtherein. The gas under pressure from the nipple creates a vacuum at apoint outside the chamber and thereby gives a freer and a greater flowof air into the chamber with the gas, the volume of air surrounding thevolume of gas. The air impinging upon the surface ais deflected inwardmixing with the gas. The flow striking the solid cap of the chamber isthereby caused to rebound in counter currents over the studded walls ofthe chamber and thereby produce a further I commingling of the air andgas in the chamber between the beveled shoulder and the exit openings.This cushions the flow at the exit openings and prevents a spurting andfrictional action of the outflow, and. this is what renders the actionof the mixer noiseless. It is this cushioned and retarding eiiect of theoutflow at the exit openings that prevents flashing back of the flameinto the mixing chamber. The action of the wall deflectors is to breakand deflect the flow into small eddies or circles and thereby thoroughlymix the air and gas without interfering with the proper flow to theexit-opening through which the flow will take place at a pressure whichgives a satisfactory delivery and force to the blaze at the burner, andto give a perfect c0mbustion and noiseless action. The outer wall of thecasting has a screw thread just below the exit side of the openings, bywhich to attach the burner not shown.

It is evident that immaterial departures may be permitted from thegeneral construction and arrangement of parts contributing toward myinvention, and for this reason I do not wish to be understood aslimiting myself thereto in precise detail and construction, as forinstance, the lower part of the mixing chamber may not be tapering; andthe nipple maybe secured by other means than that shown.

I claim as my improvement- 1. A gas and air mixer consisting of achamber of two diameters, the one of least diameter having its wallsstudded with projections or knobs and having a, solid cap at its exitend, for the purpose stated.

2. A gas mixer consisting of a chamber having a solid cap at its exitend and its inner walls studded with projections or knobs, for thepurpose stated.

3. A gas mixer consisting of a chamber of greater length than width, itsgreatest width being at its inlet end and its least width at its exitend and tapering from its inlet to its' outlet, its smallest endterminating in a solid cap having exit openings in its walls, saidchamber divided by a beveled shoulder and that part between the exit andthe said shoulder being studded with wall projections, substantially asdescribed.

In testimony whereof I have hereunto signed this specification in thepresence of two subscribing witnesses.

DAVID P. STIRK.

WVitnesses:

L. B. SW'IFT, W. W. WINSLOO.

